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ext4: validate p_idx bounds in ext4_ext_correct_indexes

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: ext4: validate p_idx bounds in ext4_ext_correct_indexes ext4_ext_correct_indexes() walks up the extent tree correcting index entries when the first extent in a leaf is modified. Before accessing path[k].p_idx->ei_block, there is no validation that p_idx falls within the valid range of index entries for that level. If the on-disk extent header contains a corrupted or crafted eh_entries value, p_idx can point past the end of the allocated buffer, causing a slab-out-of-bounds read. Fix this by validating path[k].p_idx against EXT_LAST_INDEX() at both access sites: before the while loop and inside it. Return -EFSCORRUPTED if the index pointer is out of range, consistent with how other bounds violations are handled in the ext4 extent tree code.

Announced Source revision 1
Original source ↗

CVE-2026-31449

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-31449

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "a86c61812637c7dd0c57e29880cffd477b62f2e7",
        "lessThan": "39d6e2b67651614bac0dc6592fa9836321910067",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a86c61812637c7dd0c57e29880cffd477b62f2e7",
        "lessThan": "c5839b34704c9c2f47f079451bdbb22de0da1ed1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a86c61812637c7dd0c57e29880cffd477b62f2e7",
        "lessThan": "10242e640b36b91ad03d25f3dc77854bbdff8358",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a86c61812637c7dd0c57e29880cffd477b62f2e7",
        "lessThan": "4d08401aa13f1531216f1a7ae281ca4806e90a5c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a86c61812637c7dd0c57e29880cffd477b62f2e7",
        "lessThan": "407c944f217c17d4343148011acafebc604d55e1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a86c61812637c7dd0c57e29880cffd477b62f2e7",
        "lessThan": "93f2e975ed658ce09db4d4c2877ca2c06540df83",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a86c61812637c7dd0c57e29880cffd477b62f2e7",
        "lessThan": "01bf1e0b997d82c0e353b51ed74ef99698043c33",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a86c61812637c7dd0c57e29880cffd477b62f2e7",
        "lessThan": "2acb5c12ebd860f30e4faf67e6cc8c44ddfe5fe8",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "fs/ext4/extents.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.19"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.19",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.259",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.210",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.175",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.140",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.80",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.21",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19.11",
        "versionType": "semver",
        "lessThanOrEqual": "6.19.*"
      },
      {
        "status": "unaffected",
        "version": "7.0",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/ext4/extents.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-31449

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#39879 · Revision 1
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Publisher date
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